Burglar-alarm.



PA'TENTED APR. 26, 1904.v

A. P. ISGHIFFLING. YBmmrLAR ALARM.

APPLIUTON FILED 1330.3. 1903.

HG MODEL.

gli/we n tot Patented April 26, 1904.

'UNITED STATES PATENT @einen ALBERT F. SCHFFLNG, QF INDIANAPOLIS, NDIANA.

BuRGL-AR-ALARM.

srncIFIcATIoN forming pm Cf meters Patent ivo. 758,389, dated April 26,1904.

Anplicationrfiled December 3, 1903. Serial No. 183,658. (No model.)

To rtl/, whom, it worry concern: A'

Be it known that L ALBERT F. ScnrrrLrNG, 1

a citizen of the United States,rresiding at Indianapolis, in the county of Marion and State of Indiana, have inventedcertain new and useful Improvements in Burglar-Alarms-of which thefollowing is a specification, reference being l had therein to the accompanying drawings.

knob is turned an alarm will befsounded for` Athe purpose of attracting attention.

The object of this invention is to providea means which when applied to a door-'knob the slightest movement of the said knob will opi erate the mechanism to cause the alarm-bell v to ring; also, to provide means whereby the mechanism can be readily disconnected from the door-knob, so that an alarm be not made when it is not required, as during the daytime. I attain these objects by means of the mechanism illustrated in the accompanying drawings, in which similar numerals ot' reference designate like parts.'

Figure 1 isya broken view of a portion of a door looking at the interior side thereof and showing my invention of a burglar-alarm applied thereto. Fig. 2 is an end broken view of the same, partly inl section. Fig. 3 is a broken view of a door, showing the push-hutton whereby an alarm may be made from the outside.. Fig. 4 is an enlarged view of the lever for operating the push-bar of. the alarmbell and looking in the direction of the arrow a. See' Fig. 5.) Fig. 5 isa side view of said bell looking in the direction of the arrow b. Fig. 6 is an enlarged sectional view of the throw-out sleeve. Fig. 7 is a similar view of said sleevelooking in the direction ofthe arrow 0. (See'Fig. 6.) Fig. 8 is a diagram ot' the cam-rollers for operating the bell-lever and showing said rollers in their normal position, and Fig. 9 is a similar diagram View showing one of the rollers in contact with the throwout socket of the hell-lever to depress the latter.

A door 1 may be of the usual form of construction provided with the usual door-knobs 2, whereby the latch 3 is manually operated to unlatch or disengage its catch to permit the door 1 to-be opened. A clamp 4, carrying the cam-rollers 5 and 6, is adapted to encircle the shank'7 of the inner vknob of the door to clamp same andV retainl the cam-rollers 5 and 6 in iposition to Contact the sleeve 8 of the belloperating lever y9. The bell-lever 9 is ful-` crumed on its fulcrum-bracket 10, secured on the inner side of thedoor 1, and the forked end 11 of the said 4lever 9 is adapted to bear against the-push-loar 12 of the alarm-bell 13, s6-'that when the sleeve 8 is engaged by either 1 of the cam-rollers 5 or 6 the same is depressed at its end and the forked end 11 of said lever 9 ist'orced 'against the push-har 12 to move the same torelease the bell-hammer mechanism to sound an alarm.

y'llt is frequently necessary time that the alarm mechanism connected with the door-knobv be disconnected, 'so' that the door may be opened and closed without causing an alarm. To accomplish this purpose, I construct the sleeve 8 in such' a manner that the same may be quickly slid along the end of the lever 9y to move the same out of the plane of contact of the cam-rollers 5 and 6 and be secured in such. position, which element I will now proceed to describe. y

during the dayv The sleeve 8 is vprovided with a central bore T 14, which is adapted to receive the end of the lever 9 to fully slide thereon. A lock-pin 15 is secured in Vproper position on the lever 9, and the slot 16 is formed in the side of the said sleeve 8 and extends along a portion of its length, and said slot terminates at its end in an engaging notch 17, so that when the said 4sleeve is raised-by means of the handle 18,

withits pin 15 in said slot 16, the sleeve is moved till the pin 'has reached the bottom of the latter, when by a slight turn of said sleeve 8 the notch 17 is caused to engage the pin 15, thereby holding the lower end of said sleeve above the plane of contact of the cam-rollers 5 and 6. When it is necessary to drop the sleeve '8 into position to be engaged by the cam-rollers 5 and 6, all that is necessary to he done is to slightly turn the said sleeve 8 by means ot' its handle 18 to disengage the pin 15 from the notch 17 and permit the said sleeve 8 to fall by gravity into engaging position, as shown in Fig. 3.

Referring particularly to Fig. 2,-it will be readily seen that an ordinary push-button alarm or annunciator may be used in connection with the above burglar-alarm mechanism. The push-button 19 is situated in position on the exterior of the door, and the said door is bored to receive the push-rod 20, which extends from the end of the push-button 19 and passes between the prongs of the forked end l1 of the lever 9 into the counterbore of the push-bar 12 of the alarm-bell, and thus when the said push-button ris moved the push-bar 12 is moved a corresponding extent to cause the alarm-bell 13 to sound the alarm without in any manner interfering with the alarm Iciechanism connected to the knob 2 of the oor.

The operation of this device will be readily understood from the following: Suppose the knob 2 is grasped by some one on the outside and turned to either the right or the left to cause either the cam-roller 5 or 6 to contact with the sleeve 8, the same will be depressed from its normal position, as shown in dotted lines, into the new position shown in full lines. (See Fig. 8.) This movement of the sleeve 8 causes the forked end 11 of the lever 9 to move the push-bar 12 of the alarm-bell 13 to release the bell-hammer, and thereby cause the latter to operate to sound an alarm. The operation is so simple and so self-evident from the drawings that further description is deemed unnecessary.

Having thus fully described this my invention, what I claim as new and useful, and desire tocover by Letters Patent of the United States therefor, is-

1. In an alarm, the combination with a doorbell having a projecting push-bar for releasing the ringing mechanism of said bell, of a cam adapted to be secured to a door-knob, a lever situated to extend from said door-knob to said push-bar of said bell and fulcrumed at a point intermediate its ends so as to move in a plane at right angles With the plane of rotation of the knob of the door, said lever arranged to be operatively engaged by said cam on said doorknob and operatively connected to said pushbar.

2. In an alarm, the combination with adoor- -bell having a projecting push-bar for releasing the ringing mechanism of said bell, of a cam adapted to be secured toa door-knob, a lever operatively connected at one end to said pushbar and at its opposite end to said cam, and an extensible piece on the cam end of said lever arranged to be moved into position to contact said cams.

3. In an alarm, the combination with a doorbell having a projecting push-bar for releasing the ringing mechanism of said bell, a doorknob clamp, rollers pivotally mounted in said clamp, a lever situated to extend from said door-knob to said push-bar of said bell, said lever provided with a forked end adapted to contact the end of said push-bar, and an extensible end said extensible end arranged to be moved into position betweensaid rollers to depress said extensible end of said lever when the door-knob is turned.

4. In an alarm, the combination with adoorbell having a projecting push-bar for releasing the ringing mechanism of said bell, a doorknob clamp, rollers pivotally mounted on said clamp, a lever situated to extend from said door-knob to said push-bar of said bell, said lever provided with a fork adapted to contact the projecting end of said push-bar, and having mounted on its opposite end an extensible sleeve, a sleeve catch and a sliding sleeve mounted onl said sleeve-receiving end of said lever, said sleeve provided with a longitudinally-extending slot as described substantially as and for the purpose set forth.

In testimony whereof I afHx my signature in presence of two witnesses.

ALBERT F. SCHIFFLING.

Witnesses:

THOMPSON R. BELL, GEORGE HITZ. 

